The reality star, 23, filed for legal separation from husband Spencer Pratt at a Santa Monica courthouse on Tuesday, listing irreconcilable differences as the reason for the split.
But Montag did not file divorce papers. According to reports, filing for legal separation means the reality star’s earnings will become her separate property beginning on the date of separation, which she lists as June 8. The Hills star's papers do not list a lawyer.
After news of their separation first broke, Montag told PEOPLE she moved out of the Pacific Palisades, Calif., home she shared with Pratt. "There are so many lies out there about me and I just needed space – even away from my husband," she told PEOPLE at the time. Saying she needed to "to concentrate on myself," the reality star moved in with a pal, Jen Bunney. The two will also be filming a reality show, and Montag says she wants to write a movie script.
But Montag's Hills castmates were skeptical about the breakup, calling her split with Pratt just another publicity stunt.
"I think it's a joke," Audrina Patridge told PEOPLE at Sunday's MTV Movie Awards in L.A. "I don't believe it. They're inseparable and in love."
Reps for Montag and Pratt were not immediately available for comment.
TMZ.com first reported news of the legal filing.